230 
Journal of Agricultural Research 
Vol. IX, No. 7 
the fertilization. On comparing the column of averages for these two 
plots it is seen that the nitrate content of plot 14 was small as compared 
with that found in plot 13. But, notwithstanding the limited supply 
of nitrates in this soil, it is seen that approximately 75 per cent of the 
nitric nitrogen found to a depth of 4 feet was confined in the upper 3 
inches of soil. In plot 14 the maximum amount found at each depth 
was in boring 4, which was farthest from the furrows, indicating a 
consistent lateral movement of the nitric nitrogen. 
Table XXII .—Distribution of nitrates at right angles to furrows , Citrus Experiment 
Station grove, Arlington, Cal. 
[Results expressed as milligrams of nitrogen per ioo gms. of soil] 
Plot No., material 
added, and samp¬ 
ling date. 
Depth. 
Inches. 
13 (dried blood), 
sampled Sept. 12, 
1916. 
14 (control), sam¬ 
pled Sept. 13, 19x6. 
36 (control), sam¬ 
pled Sept. 13, 1916. 
35 (barley - straw 
mulch and nitrate 
of lime), sampled 
Sept. 13,1916. 
36 (alfalfa hay), sam¬ 
pled Sept. 13,1916. 
o- 3 
3- 6 
6- 9 
9-13 
12-24 
24-36 
36-48 
o- 3 
3- 6 
6 - 9 
9-13 
12-24 
34-36 
36-48 
• o- 3 
3- 6 
6 - 9 
9-12 
12-34 
24-36 
36-48 
o- 3 
3“ 6 
6 - 9 
9-12 
12-24 
24-36 
36-48 
o~ 3 
3- 6 
6- 9 
9-12 
12-24 
24-36 
36-48 
Boring No. 
1 
2 
3 
4 
5 
6 
7 
8 
3-37 
5-32 
•39 
•39 
27.90 
3- 61 
*•37 
•78 
40. 78 
3-19 
1.16 
1.86 
xi. 38 
1.20 
.46 
•53 
2. 28 
1.69 
•43 
.36 
0.64 
. 22 
.39 
1. 27 
•36 
.60 
•99 
•25 
. 32 
. IX 
4* 77 
•43 
.22 
.35 
8- 5.1 
.81 
.46 
.46 
*•44 
•25 
. XX 
. XX 
.46 
.18 
.29 
. XX 
.08 
.18 
• 15 
. XX ; 
•59 
•49 
.38 
•33 
6.94 
1-43 
•64 
1-77 
7 • 78 
.89 
■ 71 
•3» 
5.26 1 
.85 
.78 
•39 
4.81 
. 61 
• 7* 
.61 
•73 
.38 
•43 
•50 
•43 
. 23 
. 23 
0. 29 
.64 
.19 
3- 23 
•99 
.64 
•29 
13. 12 
•85 
.40 
. 26 
12. 76 
3-97 
I- 59 
.82 
32.00 
6.17 
6. 73 
4.42 
13. xo 
X. xo 
x. 06 
1.90 
8.62 
•7i 
•43 
•33 
•54 
. 22 
.22 
x.06 
•43 
• 19 
9.88 
3-15 
• 7* 
•99 
88. 70 
7. 26 
*• 95 
3- 72 
9. 60 
x. 06 
1.94 
1*34 
3-86 
x. 06 
x. 10 
X. 30 
I. 62 
*•73 
X.83 
•75 
1.24 
•78 
Aver¬ 
age. 
17-14 
2.40 
•63 
.69 
•43 
i-Si 
1.30 
3- 23 
•35 
. 21 
.19 
•05 
•05 
.04 
4 - 35 
.67 
•55 
•54 
• 29 
•15 
. 23 
I3.64 
1. 92 
1-44 
1.05 
•43 
•43 
. 12 
38. ox 
2.31 
1.44 
X. 64 
2. 64 
«-39 
x. 62 
Plot 25 was kept covered with barley straw, but even under a mulch 
of this character it is seen that there was a large accumulation of nitric 
nitrogen at the surface, Which varied from 3.23 to 32.0 mgm. in the 
upper 3 inches. The results also indicate a strong lateral movement to 
a depth of 12 inches. The highest nitrate content in each case was 
secured in boring 5, which was presumably the point at which the water 
met. The column of averages indicates that little nitric nitrogen has 
been carried below a depth of 3 feet and that at least two-thirds of the 
nitric nitrogen in the first 4 feet was confined to the surface 3 inches. 
Plot 26 lies immediately adjacent to plot 25 and has received no 
fertilizer of any character during the last two years. The samples . 
from this plot were taken between furrows 32 inches apart; and it is 
